spi: davinci: let DMA operation be specified on per-device basis

Let DMA operation be specified on a per-device basis instead
of selecting it once during probe.

A side effect of this is the need to combine the PIO and DMA buffer
txrx_bufs routine. This is good since they anyway share some common
functionality.

Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h
index f7586a03678c..b3ab7d04943a 100644
--- a/arch/arm/mach-davinci/include/mach/spi.h
+++ b/arch/arm/mach-davinci/include/mach/spi.h
@@ -41,6 +41,7 @@ struct davinci_spi_config {
         u8      parity_enable;
 #define SPI_IO_TYPE_INTR        0
 #define SPI_IO_TYPE_POLL        1
+#define SPI_IO_TYPE_DMA         2
         u8      io_type;
         u8      timer_disable;
         u8      c2tdelay;